Is tansy a remedy for mice? - briefly
Tansy (Artemisia dracunculus) is sometimes employed as a rodent deterrent, but scientific evidence of its efficacy against mice is weak. Consequently, it should not be relied upon as a primary control method.
Is tansy a remedy for mice? - in detail
Tansy (Tanacetum vulgare) contains volatile compounds, chiefly thujone, that are toxic to many insects and small mammals. Historical records describe its use as a repellent against rodents, but modern research provides only limited confirmation.
Efficacy
- Laboratory tests show thujone can cause irritation and aversion in mice when applied in high concentrations.
- Field studies are scarce; results vary with formulation, dosage, and environmental conditions.
- Effectiveness diminishes as the plant material ages or is exposed to moisture, because volatile oils evaporate.
Application methods
- Dried, crushed leaves placed in bait stations or near entry points may deter activity for several days.
- Essential oil diluted to 5‑10 % in water and sprayed on surfaces creates a short‑term barrier; re‑application is required every 24‑48 hours.
- Whole‑plant mulch around foundations offers limited protection, primarily by masking scents rather than delivering a lethal dose.
Safety considerations
- Thujone is neurotoxic to humans and domestic animals at high levels; handling should involve gloves and adequate ventilation.
- Ingesting large quantities of tansy can cause vomiting, seizures, or liver damage.
- Pets and children must be kept away from treated areas.
Regulatory status
- Many jurisdictions classify tansy oil as a restricted pesticide; commercial products often require registration.
- Unregistered home‑made preparations are legal but lack quality control and may pose health risks.
Alternative rodent control
- Certified rodenticides (anticoagulants, bromethalin) provide proven mortality rates when used according to label instructions.
- Mechanical exclusion (sealed entry points, steel wool) prevents access without chemical exposure.
- Integrated pest management combines sanitation, habitat reduction, and targeted baiting for sustainable results.
Conclusion Tansy exhibits repellent properties that can reduce mouse activity temporarily, but it does not reliably eliminate infestations. Its limited potency, rapid loss of active compounds, and potential toxicity make it unsuitable as a standalone solution. For effective control, combine cautious use of tansy‑based deterrents with proven exclusion techniques or regulated rodenticides.